Surficial geologic maps of the northeastern, southeastern, and southwestern portions of the Tucson Metropolitan Area

With continued expansion of Tucson into peripheral areas, growth is being met with geologic limitations and hazards, such as shrink-swell potential in soils and collapsing soils. Knowledge of surficial geology is important in understanding these conditions. This series of maps, an extension of previous work in the central and northern parts of the basin (McKittrick, 1988), delineates landforms and pertinent lithologies. Three major groups of landforms are found in the basin: stream terraces, alluvial fans and fan terraces, and pediments. The first two have been divided into relative age groups, which correlate well with some potential geologic hazards limitations. (6 pages)